import random

def lastmove( move ):
    return    

def make_move():
    if userchoice not in sequences or len(sequences[userchoice]) < 3:
        return random.choice(["剪刀", "石头", "布"])
    else:
        last_user_choices = sequences[userchoice]
        next_choices = list(sequences[userchoice].values())
        max_choice = max(next_choices)
        max_choices = [
            choice for choice in sequences[userchoice] if sequences[userchoice][choice] == max_choice
        ]
        return random.choice(max_choices)
